/Engine/Plugins/Animation/ControlRig/Source/ControlRig/Public/Rigs/RigHierarchy.h
Returns the MetadataTagChanged event, which can be used to track metadata tag changes Note: This notification has a very high volume - so the consequences of subscribing to it may cause performance slowdowns.
[FRigHierarchyMetadataTagChangedDelegate](API\Plugins\ControlRig\Rigs\FRigHierarchyMetadataTagChangedD-) & OnMetadataTagChanged()